My State Pension forecast shows a little over £12,500 a year in today's money, payable from 67. That's nine years off for me. In my retirement plan it sits right at the bottom, the guaranteed floor under everything else, the part that's meant to be certain. Every few months a headline makes me poke at how certain "certain" really is.
3 min read - Part of News & Updates at FreeBefore65.
So this is me poking at it. Not because I think the State Pension is about to vanish. Because the design of it is under more strain than most people drawing up a retirement plan realise, and the levers available to ease that strain are fewer than the noise suggests.
It runs on arithmetic, not a pot
There's a widespread belief that you pay National Insurance into something with your name on it and draw it back later. You don't. The State Pension is pay-as-you-go. The NI paid by people working today funds the pensions of people retired today. When I claim at 67, it'll be my children's generation paying for mine.
Which means the whole thing rests on one number: how many working-age people there are for every pensioner. Keep that healthy and the system funds itself. Let it slide and someone has to find the difference, through higher taxes, a later pension age, or smaller annual increases.
It's sliding.
The squeeze, in numbers
The ONS expects more than a quarter of the UK to be 65 or over by the 2070s, up from under a fifth in 2018. Fewer workers and more pensioners, for longer, because we keep living longer.
The cost is already large. The State Pension runs at around £138 billion a year, roughly 5% of everything the economy produces. In the 1950s it was nearer 2%. The OBR's central projection has it reaching 7.7% of GDP by the early 2070s, a rise of more than half. Some of that is pure demographics. A bigger slice is the triple lock, the guarantee that the pension rises each year by the highest of earnings, inflation or 2.5%. The OBR reckons the triple lock has already cost about three times what was expected when it came in, and will be running at roughly £15.5 billion a year by the end of this decade.
Three things move the ratio, and only one moves fast
If the problem is too few workers per pensioner, the age-dependency ratio only really shifts on three things: how many babies are born, how long people live, and migration in and out.
Birth rate is a slow lever. Even if it rose tomorrow, those babies don't pay tax for twenty-odd years. Longevity pulls the wrong way for the sums, because the longer we live the more pension years there are to fund. Recent improvements in life expectancy have actually stalled, which is partly why the planned rise to 68 hasn't been brought forward.
That leaves migration as the only lever that can move the ratio quickly. People arriving to work or study are overwhelmingly of working age, so a year of high net migration improves the worker-to-pensioner balance almost at once. This is why immigration keeps surfacing in any serious conversation about pension sustainability. It's the fastest available answer to the maths.
Why it isn't the answer either side wants it to be
Here's the catch, and it cuts against both of the usual arguments.
Migrants age too. The 25-year-old who arrives to work this year is a pensioner in forty. To hold the ratio steady through migration alone you'd need not just high net migration but permanently rising net migration, each year's intake larger than the last, indefinitely. No government has ever stood up and argued for that, and the public has shown no appetite for it.
And the direction of travel is the opposite. Net migration to the UK was around 171,000 in the year to December 2025, down from a peak of 944,000 less than three years earlier. The Home Secretary has described it as a fall of 82% in three years and is building a more restrictive, skills-based system on top of it. Whatever you make of that as policy, notice what it means for the pension maths. The one lever that could ease the demographic squeeze in the near term is being pulled hard in the other direction, with support across the main parties.
The ONS makes a quieter point worth keeping hold of. Higher migration does slow the ageing of the population, but the bigger swing factor may be how many older people stay in work. More of us working into our late sixties shifts the picture more than migration does. That's a far less charged lever, and it's the one creeping up almost by accident as the pension age rises.
So what actually gives
If migration is falling, birth rates are low and we're all living longer, the bill still has to be paid. Something flexes. Realistically that's the pension age, the triple lock, or both.
The pension age is the politically easier of the two. The pain is deferred, and it doesn't touch anyone already retired. It's legislated to reach 67 by 2028 and 68 in the 2040s, and the OBR's long-term projection quietly assumes 69 by the early 2070s. The IFS has floated that holding the triple lock while keeping the system affordable could imply a State Pension age of 74 by 2069. Anyone in their twenties or thirties should read that number and plan around it.
The triple lock is the harder one to touch. Cutting pensioner incomes is electoral poison, and pensioners vote. So it survives, review after review, while the cost climbs.
What I take from it, planning at 58
My State Pension is nine years away and I've built it into my floor. Having read round all of this, I haven't changed the assumption that it'll be there. Governments don't abolish the State Pension. What they do, slowly and with as little fuss as they can manage, is nudge the age back and let the increases lag what they'd otherwise have been.
So I plan for it to arrive a bit later than the timetable says, and grow a bit slower than the triple lock promises. If I'm wrong, that's an upside. I'm also aware I'm fortunate here. I've a defined-benefit pension doing most of the heavy lifting, so for me the State Pension is a top layer rather than the whole house. For plenty of people my age it's the foundation, and for them the age and the uprating aren't abstractions. They decide whether the plan works.
I'll keep checking the forecast every few months. Nine years is plenty of time for the rules to move again.
The FreeBefore65 take
If you're more than a decade out, don't plan as though today's forecast is fixed. The amount is reasonably safe. The age you can claim it, and how fast it grows once you do, are the soft variables, and both tend to drift against you over the years. Build a plan that still stands up if the State Pension turns up later and smaller than the forecast says. If you're in your twenties or thirties, assume 68 at the earliest and don't be surprised by 69 or more.
For those of us closer to it, the bigger risk isn't the pension. It's the years before it starts, the gap you have to fund yourself. That gap is the whole subject of this blog, and the demographics are a reminder that it could run a year or two longer than the timetable currently promises.
Further reading:
Part of News & Updates at FreeBefore65
Tony writes about his personal journey to early retirement at freebefore65.co.uk. He is not a financial adviser. All content reflects his own experience and research and should be taken as a starting point for your own thinking, not as professional advice.*
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